Income Tax - Deferred Tax Assets And Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Deferred tax assets
Compensation-related obligations	$ 43.5	$ 47.1
Pension and postretirement benefits	(3.7)	14.2
Tax credit carryforwards	51.8	37.8
Tax loss carryforwards	314.7	305.3
Accrued liabilities and other	156.8	216.4
Valuation allowance	(105.4)	(79.9)
Deferred tax assets	457.7	540.9
Deferred tax liabilities
Fixed assets	346.9	348.6
Partnerships and investments	50.5	44.9
Intangible assets	2,232.3	2,738.3
Derivative instruments	12.6	42.3
Accrued liabilities and other	26.2	13.4
Deferred tax liabilities	2,668.5	3,187.5
Net deferred tax liabilities	$ 2,210.8	$ 2,646.6